I heard a report on the radio last week that said most people lie about what they did at the weekend. I can only imagine that making stuff up concerning "fun" times is universal. Since the standerd claims people give are "hang out with friends, clubbing, going to pubs" it's a safe bet that if you live in a large city, you can lie about doing just that and no one can prove otherwise.
I don't lie though. I tell the truth. It always fails to impress.